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The excludeClean field is set for each package/versionType combination and specifies those directories needed for execution of the compiled programs. The cleanBuild program effectively removes all source code and intermediary build objects and just leaves the executables and necessary data files.
Note: This program does not currently run for any builds built by the Jenkins system as there has been no mechanism set up to trigger this program through Jenkins. It will, however, run properly if invoked manually on those systems.